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| author | Pranith Kumar <bobby.prani@gmail.com> | 2014-07-08 17:46:50 -0400 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2014-09-07 16:18:07 -0700 |
| commit | 4de376a1b14e32f550931274f06b571abc0f3d4b (patch) | |
| tree | 2641f4598c5580d05652593f8c6bd4f601b94f4a /kernel/rcu/tree.c | |
| parent | 11ed7f934cb807f26da09547b5946c2e534d1dac (diff) | |
| download | blackbird-op-linux-4de376a1b14e32f550931274f06b571abc0f3d4b.tar.gz blackbird-op-linux-4de376a1b14e32f550931274f06b571abc0f3d4b.zip | |
rcu: Remove remaining read-modify-write ACCESS_ONCE() calls
Change the remaining uses of ACCESS_ONCE() so that each ACCESS_ONCE() either does a load or a store, but not both.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/tree.c')
| -rw-r--r-- | kernel/rcu/tree.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 1b70cb6fbe3c..4b526ca46801 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1684,7 +1684,8 @@ static int rcu_gp_fqs(struct rcu_state *rsp, int fqs_state_in) if (ACCESS_ONCE(rsp->gp_flags) & RCU_GP_FLAG_FQS) { raw_spin_lock_irq(&rnp->lock); smp_mb__after_unlock_lock(); - ACCESS_ONCE(rsp->gp_flags) &= ~RCU_GP_FLAG_FQS; + ACCESS_ONCE(rsp->gp_flags) = + ACCESS_ONCE(rsp->gp_flags) & ~RCU_GP_FLAG_FQS; raw_spin_unlock_irq(&rnp->lock); } return fqs_state; @@ -2505,7 +2506,8 @@ static void force_quiescent_state(struct rcu_state *rsp) raw_spin_unlock_irqrestore(&rnp_old->lock, flags); return; /* Someone beat us to it. */ } - ACCESS_ONCE(rsp->gp_flags) |= RCU_GP_FLAG_FQS; + ACCESS_ONCE(rsp->gp_flags) = + ACCESS_ONCE(rsp->gp_flags) | RCU_GP_FLAG_FQS; raw_spin_unlock_irqrestore(&rnp_old->lock, flags); wake_up(&rsp->gp_wq); /* Memory barrier implied by wake_up() path. */ } |
